What are those black in the teeth?

Reason 1: Pigmentation
If you usually like to drink coffee, tea, or smoke, the black stuff between your teeth is most likely caused by pigmentation. Of course, even if you don’t have these habits, there may be pigmentation, but the probability will be lower.
If the gap between the teeth is black, you only need to go to the dental hospital to wash your teeth regularly.
  
Reason two: dental caries
There is another possibility that caries, that is, cavities, will also turn black. In this case, it is generally sufficient to fill the tooth. Before filling the tooth, the caries will be cleaned up first, and then the filling will be done.

Tooth decay only needs to be filled, and in the middle and late stages, root canal treatment or extraction is required.

China Dental Lab Remind you to care for teeth and care for health